Openbravo 3, the agile ERP, is a modular, ready to use, 100% web-based open source business management system written in Java, that automates all of the core business processes for small and mid-sized companies.

FrontAccounting (FA) is a professional web-based Accounting system for the entire ERP chain written in PHP, using MySQL. FA is multilingual and multicurrency. For further information and more downloads, visit our website, http://frontaccounting.com.

Open Source Point of Sale is a web based point of sale system written in the PHP language. It uses MySQL as the data storage back-end and has a simple user interface.
If you like the project, and you are making money out of it on a daily basis, then consider to buy me a coffee so I can keep adding features.

All development will continue here under a BSD license:
https://github.com/web2project/web2project
LAMP-based Project Management System focused on satisfying real-world business requirements based on community feedback. Built on a modular app framework, it allows Add On modules & customizations to interact almost seamlessly. (dotproject fork)